High temperature and vector curvature sensor with high linearity and sensitivity based on asymmetric dual-core photonic crystal fiber

A high linear sensitivity fiber temperature and vector curvature sensor based on dual-core photonic crystal fiber was designed and implemented. Theoretical and experimental results show that, the temperature sensing sensitivity at 30 degrees C-510 degrees C is 61.68 pm degrees C-1, and the linear fitting coefficient is up to 0.998. The sensor can realize high linear (0.997) vector bending sensing on the plane where the two cores are located, and the sensing sensitivity is 3262.57 nm mm and -1608.56 nm mm respectively. Compared with fiber sensors based on complex and fragile structures, it has higher mechanical strength, wider sensing range, and simple preparation process. (C) 2020 The Japan Society of Applied Physics.